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    Expansion Vessels & Ancillaries

    Expansion vessels, also known as expansion tanks, can be found in most domestic pressurised heating systems. If you have a combi boiler, you will have an expansion vessel. This vessel contains air and water from the central heating system, and its purpose is to maintain the right level of pressure in the system.

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    Picture of 8L CORE Heating Expansion Vessel

    8L CORE Heating Expansion Vessel

    CHV8L
    CORE Heating Expansion Vessel 8 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C.
    Stock Availability: In stock
    Picture of 12L CORE Heating Expansion Vessel

    12L CORE Heating Expansion Vessel

    CHV12L
    CORE Heating Expansion Vessel 12 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C.
    Stock Availability: In stock
    Picture of 18L CORE Heating Expansion Vessel

    18L CORE Heating Expansion Vessel

    CHV18L
    CORE Heating Expansion Vessel 18 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C.
    Stock Availability: In stock
    Picture of 25L CORE Heating Expansion Vessel

    25L CORE Heating Expansion Vessel

    CHV25L
    CORE Heating Expansion Vessel 25 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C.
    Stock Availability: In stock
    Picture of 35L CORE Heating Expansion Vessel

    35L CORE Heating Expansion Vessel

    CHV35L
    CORE Heating Expansion Vessel 35 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C. (with legs)
    Stock Availability: In stock
    Picture of 50L CORE Heating Expansion Vessel

    50L CORE Heating Expansion Vessel

    CHV50L
    CORE Heating Expansion Vessel 50 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C. (with legs)
    Stock Availability: In stock
    Picture of 80L CORE Heating Expansion Vessel

    80L CORE Heating Expansion Vessel

    CHV80L
    CORE Heating Expansion Vessel 80 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C. (with legs)
    Stock Availability: In stock
    Picture of 100L CORE Heating Expansion Vessel

    100L CORE Heating Expansion Vessel

    CHV100L
    CORE Heating Expansion Vessel 100 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C. (with legs)
    Stock Availability: In stock
    Picture of 150L CORE Heating Expansion Vessel

    150L CORE Heating Expansion Vessel

    CHV150L
    CORE Heating Expansion Vessel 150 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C. (with legs)
    Stock Availability: In stock
    Picture of 200L CORE Heating Expansion Vessel

    200L CORE Heating Expansion Vessel

    CHV200L
    CORE Heating Expansion Vessel 200 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C. (with legs)
    Stock Availability: In stock
    Picture of 300L CORE Heating Expansion Vessel

    300L CORE Heating Expansion Vessel

    CHV300L
    CORE Heating Expansion Vessel 300 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C. (with legs)
    Stock Availability: Out of stock
    Picture of 400L CORE Heating Expansion Vessel

    400L CORE Heating Expansion Vessel

    CHV400L
    CORE Heating Expansion Vessel 400 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C. (with legs)
    Stock Availability: Out of stock
    Picture of 500L CORE Heating Expansion Vessel

    500L CORE Heating Expansion Vessel

    CHV500L
    CORE Heating Expansion Vessel 500 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C. (with legs)
    Stock Availability: In stock
    Picture of 600L CORE Heating Expansion Vessel

    600L CORE Heating Expansion Vessel

    CHV600L
    CORE Heating Expansion Vessel 600 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C. (with legs)
    Stock Availability: Out of stock
    Picture of 800L CORE Heating Expansion Vessel

    800L CORE Heating Expansion Vessel

    CHV800L
    CORE Heating Expansion Vessel 800 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C. (with legs)
    Stock Availability: Out of stock
    Picture of 1000L CORE Heating Expansion Vessel

    1000L CORE Heating Expansion Vessel

    CHV1000L
    CORE Heating Expansion Vessel 1000 Litre. 6 bar Maximum Working Pressure. Working Temperature -10 - 70°C. (with legs)
    Stock Availability: Out of stock
    Picture of 8L CORE Potable Expansion Vessel

    8L CORE Potable Expansion Vessel

    CPV8L
    CORE Potable Expansion Vessel 8 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: In stock
    Picture of 12L CORE Potable Expansion Vessel

    12L CORE Potable Expansion Vessel

    CPV12L
    CORE Potable Expansion Vessel 12 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: In stock
    Picture of 18L CORE Potable Expansion Vessel

    18L CORE Potable Expansion Vessel

    CPV18L
    CORE Potable Expansion Vessel 18 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: In stock
    Picture of 24L CORE Potable Expansion Vessel

    24L CORE Potable Expansion Vessel

    CPV24L
    CORE Potable Expansion Vessel 24 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: In stock
    Picture of 35L CORE Potable Expansion Vessel

    35L CORE Potable Expansion Vessel

    CPV35L
    CORE Potable Expansion Vessel 35 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: In stock
    Picture of 50L CORE Potable Expansion Vessel

    50L CORE Potable Expansion Vessel

    CPV50L
    CORE Potable Expansion Vessel 50 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: In stock
    Picture of 80L CORE Potable Expansion Vessel

    80L CORE Potable Expansion Vessel

    CPV80L
    CORE Potable Expansion Vessel 80 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: In stock
    Picture of 100L CORE Potable Expansion Vessel

    100L CORE Potable Expansion Vessel

    CPV100L
    CORE Potable Expansion Vessel 100 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: In stock
    Picture of 150L CORE Potable Expansion Vessel

    150L CORE Potable Expansion Vessel

    CPV150L
    CORE Potable Expansion Vessel 150 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: Out of stock
    Picture of 200L CORE Potable Expansion Vessel

    200L CORE Potable Expansion Vessel

    CPV200L
    CORE Potable Expansion Vessel 200 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: In stock
    Picture of 300L CORE Potable Expansion Vessel

    300L CORE Potable Expansion Vessel

    CPV300L
    CORE Potable Expansion Vessel 300 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: In stock
    Picture of 500L CORE Potable Expansion Vessel

    500L CORE Potable Expansion Vessel

    CPV500L
    CORE Potable Expansion Vessel 500 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: Out of stock
    Picture of 750L CORE Potable Expansion Vessel

    750L CORE Potable Expansion Vessel

    CPV750L
    CORE Potable Expansion Vessel 750 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: Out of stock
    Picture of 1000L CORE Potable Expansion Vessel

    1000L CORE Potable Expansion Vessel

    CPV1000L
    CORE Potable Expansion Vessel 1000 Litre. 10 bar Maximum Working Pressure. Working Temperature -10 - 100 °C. WRAS approved.
    Stock Availability: Out of stock
    Picture of Advantay ER-18 Heating Vessel (Red)

    Advantay ER-18 Heating Vessel (Red)

    AD0093000018
    Advantay ER series 18 Litre Heating Expansion Vessel. 3/4” Male Connection. Max Operating Pressure 8 bar (pre-set 1.5 bar), Max Operating Temp 99°C, Height 410mm, Wall mounting (with suitable bracket) - Red
    Stock Availability: Out of stock
    Picture of Advantay ER-24 CE Heating Vessel (Red)

    Advantay ER-24 CE Heating Vessel (Red)

    AD0093000024
    Advantay ER series 24 Litre Heating Expansion Vessel. 3/4” Male Connection. Max Operating Pressure 8 bar (pre-set 1.5 bar), Max Operating Temp 99°C, Height 355mm, Wall mounting (with suitable bracket) - Red
    Stock Availability: Out of stock
    Picture of Advantay ERCE 35 Heating Vessel (Integral Bracket)

    Advantay ERCE 35 Heating Vessel (Integral Bracket)

    AD0093000035
    Advantay ER series 35 Litre Heating Expansion Vessel with Integrated Bracket. 3/4” Male Connection. Max Operating Pressure 10 bar (pre-set 1.5 bar), Max Operating Temp 99°C, Height 390mm – Red
    Stock Availability: Out of stock
    Picture of Advantay ERCE 50 Heating Vessel (Integral Bracket)

    Advantay ERCE 50 Heating Vessel (Integral Bracket)

    AD0093000050
    Advantay ER series 50 Litre Heating Expansion Vessel with Integrated Bracket. 3/4” Male Connection. Max Operating Pressure 10 bar (pre-set 1.5 bar), Max Operating Temp 99°C, Height 500mm – Red
    Stock Availability: Out of stock
    Picture of Advantay ERCE 100 Heating Vessel (Floor Standing)

    Advantay ERCE 100 Heating Vessel (Floor Standing)

    AD0093000100
    Advantay ER series 100 Litre Free Standing Heating Expansion Vessel. 3/4” Male Connection. Max Operating Pressure 10 bar (pre-set 1.5 bar), Max Operating Temp 99°C, Height 775mm – Red
    Stock Availability: Out of stock
    Picture of Advantay ERCE 250 Heating Vessel (Floor Standing)

    Advantay ERCE 250 Heating Vessel (Floor Standing)

    AD0093000250
    Advantay ER series 250 Litre Free Standing Heating Expansion Vessel. 1” Male Connection. Max Operating Pressure 10 bar (pre-set 1.5 bar), Max Operating Temp 99°C, Height 1160mm – Red
    Stock Availability: Out of stock
    Picture of Advantay ERCE 300 Heating Vessel (Floor Standing)

    Advantay ERCE 300 Heating Vessel (Floor Standing)

    AD0093000300
    Advantay ER series 300 Litre Free Standing Heating Expansion Vessel. 1” Male Connection. Max Operating Pressure 10 bar (pre-set 1.5 bar), Max Operating Temp 99°C, Height 1240mm – Red
    Stock Availability: Out of stock
    Picture of Advantay D-11 Potable Vessel

    Advantay D-11 Potable Vessel

    AD0093100011
    Advantay D series 11 Litre Potable Heating Expansion Vessel. 3/4” Male Connection. Max Operating Pressure 10 bar (pre-set 3 bar), Max Operating Temp 99°C, Height 300mm, Wall mounting (with suitable bracket) - White
    Stock Availability: Out of stock
    Picture of Advantay D-2 Potable Vessel

    Advantay D-2 Potable Vessel

    AD0093100002
    Advantay D series 2 Litre Potable Heating Expansion Vessel. 1/2” Male Connection. Max Operating Pressure 8 bar (pre-set 1.5 bar), Max Operating Temp 99°C, Height 230mm, Wall mounting (with suitable bracket) - White
    Stock Availability: In stock
    Picture of Advantay D-35 CE Potable Vessel

    Advantay D-35 CE Potable Vessel

    AD0093100035
    Advantay D series 35 Litre Potable Heating Expansion Vessel. 1” Male Connection. Max Operating Pressure 10 bar (pre-set 3 bar), Max Operating Temp 99°C, Height 390mm, Wall mounting (with suitable bracket) - White
    Stock Availability: Out of stock
    Picture of Advantay D-5 Potable Vessel

    Advantay D-5 Potable Vessel

    AD0093100005
    Advantay D series 5 Litre Potable Heating Expansion Vessel. 3/4” Male Connection. Max Operating Pressure 10 bar (pre-set 3 bar), Max Operating Temp 99°C, Height 225mm, Wall mounting (with suitable bracket) - White
    Stock Availability: Out of stock
    Picture of Advantay AFH-200 CE horz 10bar Expansion Vessel

    Advantay AFH-200 CE horz 10bar Expansion Vessel

    AD0093500200
    Advantay 200 Litre Horizontal Expansion Vessel complete with universal pump mounting bracket. 1.1/4” Male Connection. Max Operating Pressure 10 bar (pre-set 1.5 bar), Max Operating Temp 99°C, Height 665mm - Blue
    Stock Availability: Out of stock
    Picture of Heatrae Sadia Pack U2 Expansion Vessel,PRV & NRV

    Heatrae Sadia Pack U2 Expansion Vessel,PRV & NRV

    95970351
    Heatrae Sadia Pack U2 Expansion Vessel, PRV & NRV
    Stock Availability: In stock
    Zip AQ2 Expansion Vessel & Check Valve

    Zip Expansion Vessel & Check Valve

    ZPAQ2
    Zip 2 Litre Expansion Vessel & Check Valve (3.5bar) Unvented Installation Kit – AQ2

    Compatible with 5, 10 and 15L Zip Aquapoint and Varipoint water heaters
    Stock Availability: In stock
    Zip AQ1 Pressure & Temperature Relief Valve

    Zip Pressure & Temperature Relief Valve

    ZPAQ1
    Zip Pressure and Temperature Relief Valve (7 bar) - AQ1

    Compatible with 5, 10 and 15L Zip Aquapoint and Varipoint water heaters
    Stock Availability: In stock
    Picture of 3/8" Flamco Flexvent

    3/8" Flamco Flexvent

    FLEX010
    3/8" Flamco Float Operated Flexvent - Minimum/Maximum working pressure 0.2 / 10.0 bar -Brass
    Stock Availability: In stock
    Picture of 1/2" Flamco Flexvent

    1/2" Flamco Flexvent

    FLEX015
    1/2" Flamco Float Operated Flexvent - Minimum/Maximum working pressure 0.2 / 10.0 bar
    Stock Availability: In stock
    Picture of 1/2" Flamco Flexvent Super

    1/2" Flamco Flexvent Super

    FLEXS015
    1/2" Flamco Float Operated Conical Flexvent Super - Minimum/Maximum working pressure 0.2 / 10.0 bar
    Stock Availability: In stock
    Picture of 1/2" Flamco Flexvent Top

    1/2" Flamco Flexvent Top

    FLEXT015
    1/2" Flamco Float Operated Flexvent Top - Minimum/Maximum working pressure 0.2 / 10.0 bar
    Stock Availability: Out of stock
    Picture of 1/2" CORE 508 Auto Air Vent c/w Check Valve

    1/2" CORE 508 Auto Air Vent c/w Check Valve

    AD0050800012
    1/2" Automatic Air Release Valve with isolating check valve. Max pressure 10 bar, max temperature 110°c.
    Stock Availability: In stock
    Picture of 3/8" Advantay Auto Air Vent

    3/8" Advantay Auto Air Vent

    AD0050700038
    3/8" Advantay Auto Air Vent. 110°c with max pressure of 10 bar as standard.
    Stock Availability: Out of stock
    Picture of 1/2" Auto Air Vent ART1360

    1/2" Auto Air Vent ART1360

    ALBAAV015
    Automatic Air Vent. BSP Parallel Male Ends (ISO 228/1). Body Brass CW617N Nickel Plated. 10 Bar Rated. +5°C to +110°C.
    Stock Availability: In stock
    Picture of 1/2" Automatic Air Vent for Water

    1/2" Automatic Air Vent for Water

    AAV015
    1/2" Automatic Air Vent for Water
    Stock Availability: In stock
    Picture of 15nb Hattersley 775 Auto Air Vent

    15nb Hattersley 775 Auto Air Vent

    H775015
    15mm Hattersley PN10 Automatic Air Vent Fig.775
    Stock Availability: In stock
    Picture of 1/2" Spirotop A.A.V. Type "A"

    1/2" Spirotop A.A.V. Type "A"

    SPIRO015
    1/2" Spirotop Brass Automatic Air Vent AAV Type 'A'
    Stock Availability: In stock
    Picture of 3/8" Zeparo ZUP Automatic Air Vent

    3/8" Zeparo ZUP Automatic Air Vent

    TA7891510
    3/8" Zeparo ZUP 10 Automatic Air Vent - 6 Bar, Male thread, Vertical installation.
    Stock Availability: Out of stock
    Picture of 15nb Winns Type B Auto Air Vent

    15nb Winns Type B Auto Air Vent

    WINB
    15nb Winns Brass Type B Automatic Air Vent Eliminator
    Stock Availability: In stock
    Picture of 15nb Winns Type C Auto Air Vent

    15nb Winns Type C Auto Air Vent

    WINC
    15nb Winns Brass Type C Automatic Air Vent Eliminator
    Stock Availability: Out of stock
    Picture of 15nb Crane PN10 Brass Automatic Air Vent D2003

    15nb Crane PN10 Brass Automatic Air Vent D2003

    D2003015
    15mm Crane PN10 Brass Automatic Air Vent D2003
    Stock Availability: In stock
    Picture of 25nb Crane PN10 Brass Automatic Air Vent D2003

    25nb Crane PN10 Brass Automatic Air Vent D2003

    D2003025
    25mm Crane PN10 Brass Automatic Air Vent D2003
    Stock Availability: Out of stock
    Picture of 1-1/4" Advantay Pressure Reducing Valve Female Union

    1-1/4" Advantay Pressure Reducing Valve Female Union

    AD0901600114
    1-1/4" Advantay Pressure Reducing Valve BSP, F/F union fittings. Adjustable between 0.5 to 6 bar. Pre set 3 bar maximum inlet pressure of 25 bar. Maximum water temperature of 80°c. Suitable for fluid, water and compressed air.
    Stock Availability: Out of stock
    Picture of 1-1/2" Advantay Pressure Reducing Valve Female Union

    1-1/2" Advantay Pressure Reducing Valve Female Union

    AD0901600112
    1-1/2" Advantay Pressure Reducing Valve BSP, F/F union fittings. Adjustable between 0.5 to 6 bar. Pre set 3 bar maximum inlet pressure of 25 bar. Maximum water temperature of 80°c. Suitable for fluid, water and compressed air.
    Stock Availability: In stock
    Picture of 2" Advantay Pressure Reducing Valve Female Union

    2" Advantay Pressure Reducing Valve Female Union

    AD0901600200
    2" Advantay Pressure Reducing Valve BSP, F/F union fittings. Adjustable between 0.5 to 6 bar. Pre set 3 bar maximum inlet pressure of 25 bar. Maximum water temperature of 80°c. Suitable for fluid, water and compressed air.
    Stock Availability: In stock
    Picture of 1/2" Advantay Pressure Reducing Valve (no gauge)

    1/2" Advantay Pressure Reducing Valve (no gauge)

    AD0901110012
    1/2" Advantay Compact Pressure Reducing Valve BSP, F/F. 1 to 4 bar, pre set at 3 bar adjustable pressure, max 15 bar. Max temp 80°c. (no gauge)
    Stock Availability: In stock
    Picture of 3/4" Advantay Pressure Reducing Valve (no gauge)

    3/4" Advantay Pressure Reducing Valve (no gauge)

    AD0901110034
    3/4" Advantay Compact Pressure Reducing Valve BSP, F/F. 1 to 4 bar, pre set at 3 bar adjustable pressure, max 15 bar. Max temp 80°c. (no gauge)
    Stock Availability: In stock
    Picture of 22/15mm Advantay Compact Pressure Reducing Valve c/w Gauge

    22/15mm Advantay Compact Pressure Reducing Valve c/w Gauge

    ADVRV01522
    22/15mm Advantay Compact Pressure Reducing Valve with 50mm pressure gauge. 1 to 4 bar, pre set at 3 bar adjustable pressure, max 15 bar. Max temp 80°c.
    Stock Availability: Out of stock
    Picture of 22mm Advantay Auto Bypass Valve (full bore)

    22mm Advantay Auto Bypass Valve (full bore)

    ADV5510022
    22mm Compression Automatic Full Bore Bypass Valve. Used in heating systems, reduces system noise and maintains boiler efficiency. Can be used as a system or boiler bypass. Adjustable from 0.1 to 0.6bar, manufactured from brass.
    Stock Availability: In stock
    Picture of 3/4" Advantay Auto Bypass Valve (Full Bore)

    3/4" Advantay Auto Bypass Valve (Full Bore)

    AD0055400034
    3/4” BSP M/F Automatic Full Bore Angled Bypass Valve. Used in heating systems, reduces system noise and maintains boiler efficiency. Can be used as a system or boiler bypass. Adjustable from 0.1 to 0.6bar, manufactured from brass.
    Stock Availability: Out of stock
    Picture of Heatrae Sadia Pack U1 Pressure Reducing Valve & Strainer

    Heatrae Sadia Pack U1 Pressure Reducing Valve & Strainer

    95970352
    Heatrae Sadia Pack U1 Pressure Reducing Valve & Strainer
    Stock Availability: In stock
    Zip AQ3 Pressure Reducer & Line Strainer

    Zip Pressure Reducer & Line Strainer

    ZPAQ3
    Zip Combined Pressure Reducer Valve and Line Strainer - AQ3
    Stock Availability: In stock
    Picture of Advantay Part L Compliant Filling Loop (Complete)

    Advantay Part L Compliant Filling Loop (Complete)

    AD0090200500PC
    Advantay 15mm Part L Compliant Standard Filling Loop. Complete with ball valve, flexible hose, double check valve with integral ball valve & end caps.
    Stock Availability: In stock
    Picture of Advantay Standard Combi Filling Loop c/w IV

    Advantay Standard Combi Filling Loop c/w IV

    AD0090200500
    Advantay 15mm Standard Filling Loop. Complete with ball valve, flexible hose, double check valve .
    Stock Availability: Out of stock
    Picture of 1/4" PT90 Test Point

    1/4" PT90 Test Point

    TA52179-009
    1/4" PT90 Brass Pressure Test Point BSP Thread
    Stock Availability: In stock
    Picture of 110/82mm Airsure Air Admittance Valve

    110/82mm Airsure Air Admittance Valve

    FRG110W
    110/82mm Airsure Air Admittance Valve
    Stock Availability: In stock
    Picture of 63mm Advantay Combi T/P Gauge 0-6B/0-120C 1/2"

    63mm Advantay Combi T/P Gauge 0-6B/0-120C 1/2"

    AD91548600
    63mm Advantay combined pressure & temperature gauge. 1/2" back 0-6 bar & 0-120°c.
    Stock Availability: Out of stock
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